As a piece of advice, I would personally offer some more incentive for what you're looking for. You selected some mighty new games that MSRP for 50 bucks and you're offering a much older game for them. Granted, your's is sealed which adds some stock value, but I would just sell the thing and use the cash to help fund the purchase of one of thsoe games.
Don't get me wrong, DD is a *great* game, just that so are the other games you mentioned. Who knows tho, maybe someone who hates the games you mentioned really wants DD. =) Good luck with it man - hope everything comes through.